👉 A lockhole is a type of optical component that is used in optical instruments such as microscopes and telescopes. It consists of a cylindrical lens which is designed to focus light onto a small area within its aperture, creating an image on a screen or display. Lockholes are often used because they can be used for different types of imaging tasks, such as focusing light onto specific areas or reducing the size of objects that require high magnification. They are particularly useful in microscopes and telescopes,
